When you think about all the setup, SysAdmin stuff, backups, scaling, etc you'll avoid, $200 a month ($2.4k) is pretty cheap to be able to just switch a scalable db on at a moments notice.
$200 is cheap but I'm hoping they eventually put out an option closer to the $40/mo price point just so I can play around with Postgre (I'm currently a MS SQLServer guy that wants to start branching out). I don't want to spin up a new AWS and waste time with configuration and other things and don't want to worry about hosing a currently running instance just to have a new sandbox to play in. I'd pay a reasonable amount to have something akin to a cheap "test" instance in exchange for giving up things like an SLA or dedicated support.
If you want to just play around with it, why not download and install it? No charge for that.....
Their shared DB hosting is free or 5MB and $15/mo for 20GB. It's not going to have all fancy features of the dedicated (fork, follow, etc) but it is Postgres at least.